From: Kan Liang kan.liang@linux.intel.com
When counting IMC uncore events on some TGL machines, an oops will be triggered. [ 393.101262] BUG: unable to handle page fault for address: ffffb45200e15858 [ 393.101269] #PF: supervisor read access in kernel mode [ 393.101271] #PF: error_code(0x0000) - not-present page
Current perf uncore driver still use the IMC MAP SIZE inherited from SNB, which is 0x6000. However, the offset of IMC uncore counters for some TGL machines is larger than 0x6000, e.g. 0xd8a0.
Enlarge the IMC MAP SIZE for TGL to 0xe000.
Fixes: fdb64822443e ("perf/x86: Add Intel Tiger Lake uncore support") Reported-by: Ammy Yi ammy.yi@intel.com Tested-by: Ammy Yi ammy.yi@intel.com Tested-by: Chao Qin chao.qin@intel.com Signed-off-by: Kan Liang kan.liang@linux.intel.com Cc: stable@vger.kernel.org --- arch/x86/events/intel/uncore_snb.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/events/intel/uncore_snb.c b/arch/x86/events/intel/uncore_snb.c index 3de1065..1038e9f 100644 --- a/arch/x86/events/intel/uncore_snb.c +++ b/arch/x86/events/intel/uncore_snb.c @@ -1085,6 +1085,7 @@ static struct pci_dev *tgl_uncore_get_mc_dev(void) }
#define TGL_UNCORE_MMIO_IMC_MEM_OFFSET 0x10000 +#define TGL_UNCORE_PCI_IMC_MAP_SIZE 0xe000
static void tgl_uncore_imc_freerunning_init_box(struct intel_uncore_box *box) { @@ -1112,7 +1113,7 @@ static void tgl_uncore_imc_freerunning_init_box(struct intel_uncore_box *box) addr |= ((resource_size_t)mch_bar << 32); #endif
- box->io_addr = ioremap(addr, SNB_UNCORE_PCI_IMC_MAP_SIZE); + box->io_addr = ioremap(addr, TGL_UNCORE_PCI_IMC_MAP_SIZE); }
static struct intel_uncore_ops tgl_uncore_imc_freerunning_ops = {